I'm on there now. Looks like there ain't many west of the Mississippi and east of the Sierras. I wish there were more overseas. You'd think, even with this being more related to website membership than demographics, that there would be many more atheist members from Europe.
It's probably because atheism isn't such a big deal in Europe. America is, from what I gathered when living there, a nation of many extreme cliques: if you're Christian people can tell by looking at your house from afar; if you're atheist you're more likely to go to rallys, have NO GOD mouse mats and so on. People there are far more prone to love advertising their identities, as well as indulging them (reading loads about it, going on websites like this, et cetera). Even other things, eg. homosexuality, are more exaggerated in the States, with their own far more independent sub-cultures. People in Europe don't wear their hearts on their sleeves to the same extent so if you're atheist/Christian (this is especially true with atheists because they're more common) it's more often a case of "so what? I'm not going to sing and dance about it because nobody cares and I'm not interested in their opinion on it anyway. I'm off to watch the football." It sounds like a generalisation but I think it's true on average.